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- /*
- * Copyright 2016-2023 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the Apache License 2.0 (the "License"). You may not use
- * this file except in compliance with the License. You can obtain a copy
- * in the file LICENSE in the source distribution or at
- * https://www.openssl.org/source/license.html
- */
- #if defined(__TANDEM) && defined(_SPT_MODEL_)
- # include <spthread.h>
- # include <spt_extensions.h> /* timeval */
- #endif
- #include <string.h>
- #include "internal/nelem.h"
- #include "internal/cryptlib.h"
- #include "../ssl_local.h"
- #include "statem_local.h"
- static int final_renegotiate(SSL_CONNECTION *s, unsigned int context, int sent);
- static int init_server_name(SSL_CONNECTION *s, unsigned int context);
- static int final_server_name(SSL_CONNECTION *s, unsigned int context, int sent);
- static int final_ec_pt_formats(SSL_CONNECTION *s, unsigned int context,
- int sent);
- static int init_session_ticket(SSL_CONNECTION *s, unsigned int context);
- #ifndef OPENSSL_NO_OCSP
- static int init_status_request(SSL_CONNECTION *s, unsigned int context);
- #endif
- #ifndef OPENSSL_NO_NEXTPROTONEG
- static int init_npn(SSL_CONNECTION *s, unsigned int context);
- #endif
- static int init_alpn(SSL_CONNECTION *s, unsigned int context);
- static int final_alpn(SSL_CONNECTION *s, unsigned int context, int sent);
- static int init_sig_algs_cert(SSL_CONNECTION *s, unsigned int context);
- static int init_sig_algs(SSL_CONNECTION *s, unsigned int context);
- static int init_server_cert_type(SSL_CONNECTION *sc, unsigned int context);
- static int init_client_cert_type(SSL_CONNECTION *sc, unsigned int context);
- static int init_certificate_authorities(SSL_CONNECTION *s,
- unsigned int context);
- static EXT_RETURN tls_construct_certificate_authorities(SSL_CONNECTION *s,
- WPACKET *pkt,
- unsigned int context,
- X509 *x,
- size_t chainidx);
- static int tls_parse_certificate_authorities(SSL_CONNECTION *s, PACKET *pkt,
- unsigned int context, X509 *x,
- size_t chainidx);
- #ifndef OPENSSL_NO_SRP
- static int init_srp(SSL_CONNECTION *s, unsigned int context);
- #endif
- static int init_ec_point_formats(SSL_CONNECTION *s, unsigned int context);
- static int init_etm(SSL_CONNECTION *s, unsigned int context);
- static int init_ems(SSL_CONNECTION *s, unsigned int context);
- static int final_ems(SSL_CONNECTION *s, unsigned int context, int sent);
- static int init_psk_kex_modes(SSL_CONNECTION *s, unsigned int context);
- static int final_key_share(SSL_CONNECTION *s, unsigned int context, int sent);
- #ifndef OPENSSL_NO_SRTP
- static int init_srtp(SSL_CONNECTION *s, unsigned int context);
- #endif
- static int final_sig_algs(SSL_CONNECTION *s, unsigned int context, int sent);
- static int final_early_data(SSL_CONNECTION *s, unsigned int context, int sent);
- static int final_maxfragmentlen(SSL_CONNECTION *s, unsigned int context,
- int sent);
- static int init_post_handshake_auth(SSL_CONNECTION *s, unsigned int context);
- static int final_psk(SSL_CONNECTION *s, unsigned int context, int sent);
- static int tls_init_compress_certificate(SSL_CONNECTION *sc, unsigned int context);
- static EXT_RETURN tls_construct_compress_certificate(SSL_CONNECTION *sc, WPACKET *pkt,
- unsigned int context,
- X509 *x, size_t chainidx);
- static int tls_parse_compress_certificate(SSL_CONNECTION *sc, PACKET *pkt,
- unsigned int context,
- X509 *x, size_t chainidx);
- /* Structure to define a built-in extension */
- typedef struct extensions_definition_st {
- /* The defined type for the extension */
- unsigned int type;
- /*
- * The context that this extension applies to, e.g. what messages and
- * protocol versions
- */
- unsigned int context;
- /*
- * Initialise extension before parsing. Always called for relevant contexts
- * even if extension not present
- */
- int (*init)(SSL_CONNECTION *s, unsigned int context);
- /* Parse extension sent from client to server */
- int (*parse_ctos)(SSL_CONNECTION *s, PACKET *pkt, unsigned int context,
- X509 *x, size_t chainidx);
- /* Parse extension send from server to client */
- int (*parse_stoc)(SSL_CONNECTION *s, PACKET *pkt, unsigned int context,
- X509 *x, size_t chainidx);
- /* Construct extension sent from server to client */
- EXT_RETURN (*construct_stoc)(SSL_CONNECTION *s, WPACKET *pkt,
- unsigned int context,
- X509 *x, size_t chainidx);
- /* Construct extension sent from client to server */
- EXT_RETURN (*construct_ctos)(SSL_CONNECTION *s, WPACKET *pkt,
- unsigned int context,
- X509 *x, size_t chainidx);
- /*
- * Finalise extension after parsing. Always called where an extensions was
- * initialised even if the extension was not present. |sent| is set to 1 if
- * the extension was seen, or 0 otherwise.
- */
- int (*final)(SSL_CONNECTION *s, unsigned int context, int sent);
- } EXTENSION_DEFINITION;
- /*
- * Definitions of all built-in extensions. NOTE: Changes in the number or order
- * of these extensions should be mirrored with equivalent changes to the
- * indexes ( TLSEXT_IDX_* ) defined in ssl_local.h.
- * Extensions should be added to test/ext_internal_test.c as well, as that
- * tests the ordering of the extensions.
- *
- * Each extension has an initialiser, a client and
- * server side parser and a finaliser. The initialiser is called (if the
- * extension is relevant to the given context) even if we did not see the
- * extension in the message that we received. The parser functions are only
- * called if we see the extension in the message. The finalisers are always
- * called if the initialiser was called.
- * There are also server and client side constructor functions which are always
- * called during message construction if the extension is relevant for the
- * given context.
- * The initialisation, parsing, finalisation and construction functions are
- * always called in the order defined in this list. Some extensions may depend
- * on others having been processed first, so the order of this list is
- * significant.
- * The extension context is defined by a series of flags which specify which
- * messages the extension is relevant to. These flags also specify whether the
- * extension is relevant to a particular protocol or protocol version.
- *
- * NOTE: WebSphere Application Server 7+ cannot handle empty extensions at
- * the end, keep these extensions before signature_algorithm.
- */
- #define INVALID_EXTENSION { TLSEXT_TYPE_invalid, 0, NULL, NULL, NULL, NULL, NULL, NULL }
- static const EXTENSION_DEFINITION ext_defs[] = {
- {
- TLSEXT_TYPE_renegotiate,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
- | SSL_EXT_SSL3_ALLOWED | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
- NULL, tls_parse_ctos_renegotiate, tls_parse_stoc_renegotiate,
- tls_construct_stoc_renegotiate, tls_construct_ctos_renegotiate,
- final_renegotiate
- },
- {
- TLSEXT_TYPE_server_name,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
- | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
- init_server_name,
- tls_parse_ctos_server_name, tls_parse_stoc_server_name,
- tls_construct_stoc_server_name, tls_construct_ctos_server_name,
- final_server_name
- },
- {
- TLSEXT_TYPE_max_fragment_length,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
- | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
- NULL, tls_parse_ctos_maxfragmentlen, tls_parse_stoc_maxfragmentlen,
- tls_construct_stoc_maxfragmentlen, tls_construct_ctos_maxfragmentlen,
- final_maxfragmentlen
- },
- #ifndef OPENSSL_NO_SRP
- {
- TLSEXT_TYPE_srp,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
- init_srp, tls_parse_ctos_srp, NULL, NULL, tls_construct_ctos_srp, NULL
- },
- #else
- INVALID_EXTENSION,
- #endif
- {
- TLSEXT_TYPE_ec_point_formats,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
- | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
- init_ec_point_formats, tls_parse_ctos_ec_pt_formats, tls_parse_stoc_ec_pt_formats,
- tls_construct_stoc_ec_pt_formats, tls_construct_ctos_ec_pt_formats,
- final_ec_pt_formats
- },
- {
- /*
- * "supported_groups" is spread across several specifications.
- * It was originally specified as "elliptic_curves" in RFC 4492,
- * and broadened to include named FFDH groups by RFC 7919.
- * Both RFCs 4492 and 7919 do not include a provision for the server
- * to indicate to the client the complete list of groups supported
- * by the server, with the server instead just indicating the
- * selected group for this connection in the ServerKeyExchange
- * message. TLS 1.3 adds a scheme for the server to indicate
- * to the client its list of supported groups in the
- * EncryptedExtensions message, but none of the relevant
- * specifications permit sending supported_groups in the ServerHello.
- * Nonetheless (possibly due to the close proximity to the
- * "ec_point_formats" extension, which is allowed in the ServerHello),
- * there are several servers that send this extension in the
- * ServerHello anyway. Up to and including the 1.1.0 release,
- * we did not check for the presence of nonpermitted extensions,
- * so to avoid a regression, we must permit this extension in the
- * TLS 1.2 ServerHello as well.
- *
- * Note that there is no tls_parse_stoc_supported_groups function,
- * so we do not perform any additional parsing, validation, or
- * processing on the server's group list -- this is just a minimal
- * change to preserve compatibility with these misbehaving servers.
- */
- TLSEXT_TYPE_supported_groups,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS
- | SSL_EXT_TLS1_2_SERVER_HELLO,
- NULL, tls_parse_ctos_supported_groups, NULL,
- tls_construct_stoc_supported_groups,
- tls_construct_ctos_supported_groups, NULL
- },
- {
- TLSEXT_TYPE_session_ticket,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
- | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
- init_session_ticket, tls_parse_ctos_session_ticket,
- tls_parse_stoc_session_ticket, tls_construct_stoc_session_ticket,
- tls_construct_ctos_session_ticket, NULL
- },
- #ifndef OPENSSL_NO_OCSP
- {
- TLSEXT_TYPE_status_request,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
- | SSL_EXT_TLS1_3_CERTIFICATE | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST,
- init_status_request, tls_parse_ctos_status_request,
- tls_parse_stoc_status_request, tls_construct_stoc_status_request,
- tls_construct_ctos_status_request, NULL
- },
- #else
- INVALID_EXTENSION,
- #endif
- #ifndef OPENSSL_NO_NEXTPROTONEG
- {
- TLSEXT_TYPE_next_proto_neg,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
- | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
- init_npn, tls_parse_ctos_npn, tls_parse_stoc_npn,
- tls_construct_stoc_next_proto_neg, tls_construct_ctos_npn, NULL
- },
- #else
- INVALID_EXTENSION,
- #endif
- {
- /*
- * Must appear in this list after server_name so that finalisation
- * happens after server_name callbacks
- */
- TLSEXT_TYPE_application_layer_protocol_negotiation,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
- | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
- init_alpn, tls_parse_ctos_alpn, tls_parse_stoc_alpn,
- tls_construct_stoc_alpn, tls_construct_ctos_alpn, final_alpn
- },
- #ifndef OPENSSL_NO_SRTP
- {
- TLSEXT_TYPE_use_srtp,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
- | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS | SSL_EXT_DTLS_ONLY,
- init_srtp, tls_parse_ctos_use_srtp, tls_parse_stoc_use_srtp,
- tls_construct_stoc_use_srtp, tls_construct_ctos_use_srtp, NULL
- },
- #else
- INVALID_EXTENSION,
- #endif
- {
- TLSEXT_TYPE_encrypt_then_mac,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
- | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
- init_etm, tls_parse_ctos_etm, tls_parse_stoc_etm,
- tls_construct_stoc_etm, tls_construct_ctos_etm, NULL
- },
- #ifndef OPENSSL_NO_CT
- {
- TLSEXT_TYPE_signed_certificate_timestamp,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
- | SSL_EXT_TLS1_3_CERTIFICATE | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST,
- NULL,
- /*
- * No server side support for this, but can be provided by a custom
- * extension. This is an exception to the rule that custom extensions
- * cannot override built in ones.
- */
- NULL, tls_parse_stoc_sct, NULL, tls_construct_ctos_sct, NULL
- },
- #else
- INVALID_EXTENSION,
- #endif
- {
- TLSEXT_TYPE_extended_master_secret,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
- | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
- init_ems, tls_parse_ctos_ems, tls_parse_stoc_ems,
- tls_construct_stoc_ems, tls_construct_ctos_ems, final_ems
- },
- {
- TLSEXT_TYPE_signature_algorithms_cert,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST,
- init_sig_algs_cert, tls_parse_ctos_sig_algs_cert,
- tls_parse_ctos_sig_algs_cert,
- /* We do not generate signature_algorithms_cert at present. */
- NULL, NULL, NULL
- },
- {
- TLSEXT_TYPE_post_handshake_auth,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ONLY,
- init_post_handshake_auth,
- tls_parse_ctos_post_handshake_auth, NULL,
- NULL, tls_construct_ctos_post_handshake_auth,
- NULL,
- },
- {
- TLSEXT_TYPE_client_cert_type,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS
- | SSL_EXT_TLS1_2_SERVER_HELLO,
- init_client_cert_type,
- tls_parse_ctos_client_cert_type, tls_parse_stoc_client_cert_type,
- tls_construct_stoc_client_cert_type, tls_construct_ctos_client_cert_type,
- NULL
- },
- {
- TLSEXT_TYPE_server_cert_type,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS
- | SSL_EXT_TLS1_2_SERVER_HELLO,
- init_server_cert_type,
- tls_parse_ctos_server_cert_type, tls_parse_stoc_server_cert_type,
- tls_construct_stoc_server_cert_type, tls_construct_ctos_server_cert_type,
- NULL
- },
- {
- TLSEXT_TYPE_signature_algorithms,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST,
- init_sig_algs, tls_parse_ctos_sig_algs,
- tls_parse_ctos_sig_algs, tls_construct_ctos_sig_algs,
- tls_construct_ctos_sig_algs, final_sig_algs
- },
- {
- TLSEXT_TYPE_supported_versions,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO
- | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST | SSL_EXT_TLS_IMPLEMENTATION_ONLY,
- NULL,
- /* Processed inline as part of version selection */
- NULL, tls_parse_stoc_supported_versions,
- tls_construct_stoc_supported_versions,
- tls_construct_ctos_supported_versions, NULL
- },
- {
- TLSEXT_TYPE_psk_kex_modes,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS_IMPLEMENTATION_ONLY
- | SSL_EXT_TLS1_3_ONLY,
- init_psk_kex_modes, tls_parse_ctos_psk_kex_modes, NULL, NULL,
- tls_construct_ctos_psk_kex_modes, NULL
- },
- {
- /*
- * Must be in this list after supported_groups. We need that to have
- * been parsed before we do this one.
- */
- TLSEXT_TYPE_key_share,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO
- | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST | SSL_EXT_TLS_IMPLEMENTATION_ONLY
- | SSL_EXT_TLS1_3_ONLY,
- NULL, tls_parse_ctos_key_share, tls_parse_stoc_key_share,
- tls_construct_stoc_key_share, tls_construct_ctos_key_share,
- final_key_share
- },
- {
- /* Must be after key_share */
- TLSEXT_TYPE_cookie,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST
- | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY,
- NULL, tls_parse_ctos_cookie, tls_parse_stoc_cookie,
- tls_construct_stoc_cookie, tls_construct_ctos_cookie, NULL
- },
- {
- /*
- * Special unsolicited ServerHello extension only used when
- * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set. We allow it in a ClientHello but
- * ignore it.
- */
- TLSEXT_TYPE_cryptopro_bug,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
- | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
- NULL, NULL, NULL, tls_construct_stoc_cryptopro_bug, NULL, NULL
- },
- {
- TLSEXT_TYPE_compress_certificate,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST
- | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY,
- tls_init_compress_certificate,
- tls_parse_compress_certificate, tls_parse_compress_certificate,
- tls_construct_compress_certificate, tls_construct_compress_certificate,
- NULL
- },
- {
- TLSEXT_TYPE_early_data,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS
- | SSL_EXT_TLS1_3_NEW_SESSION_TICKET | SSL_EXT_TLS1_3_ONLY,
- NULL, tls_parse_ctos_early_data, tls_parse_stoc_early_data,
- tls_construct_stoc_early_data, tls_construct_ctos_early_data,
- final_early_data
- },
- {
- TLSEXT_TYPE_certificate_authorities,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST
- | SSL_EXT_TLS1_3_ONLY,
- init_certificate_authorities,
- tls_parse_certificate_authorities, tls_parse_certificate_authorities,
- tls_construct_certificate_authorities,
- tls_construct_certificate_authorities, NULL,
- },
- {
- /* Must be immediately before pre_shared_key */
- TLSEXT_TYPE_padding,
- SSL_EXT_CLIENT_HELLO,
- NULL,
- /* We send this, but don't read it */
- NULL, NULL, NULL, tls_construct_ctos_padding, NULL
- },
- {
- /* Required by the TLSv1.3 spec to always be the last extension */
- TLSEXT_TYPE_psk,
- SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO
- | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY,
- NULL, tls_parse_ctos_psk, tls_parse_stoc_psk, tls_construct_stoc_psk,
- tls_construct_ctos_psk, final_psk
- }
- };
- /* Returns a TLSEXT_TYPE for the given index */
- unsigned int ossl_get_extension_type(size_t idx)
- {
- size_t num_exts = OSSL_NELEM(ext_defs);
- if (idx >= num_exts)
- return TLSEXT_TYPE_out_of_range;
- return ext_defs[idx].type;
- }
- /* Check whether an extension's context matches the current context */
- static int validate_context(SSL_CONNECTION *s, unsigned int extctx,
- unsigned int thisctx)
- {
- /* Check we're allowed to use this extension in this context */
- if ((thisctx & extctx) == 0)
- return 0;
- if (SSL_CONNECTION_IS_DTLS(s)) {
- if ((extctx & SSL_EXT_TLS_ONLY) != 0)
- return 0;
- } else if ((extctx & SSL_EXT_DTLS_ONLY) != 0) {
- return 0;
- }
- return 1;
- }
- int tls_validate_all_contexts(SSL_CONNECTION *s, unsigned int thisctx,
- RAW_EXTENSION *exts)
- {
- size_t i, num_exts, builtin_num = OSSL_NELEM(ext_defs), offset;
- RAW_EXTENSION *thisext;
- unsigned int context;
- ENDPOINT role = ENDPOINT_BOTH;
- if ((thisctx & SSL_EXT_CLIENT_HELLO) != 0)
- role = ENDPOINT_SERVER;
- else if ((thisctx & SSL_EXT_TLS1_2_SERVER_HELLO) != 0)
- role = ENDPOINT_CLIENT;
- /* Calculate the number of extensions in the extensions list */
- num_exts = builtin_num + s->cert->custext.meths_count;
- for (thisext = exts, i = 0; i < num_exts; i++, thisext++) {
- if (!thisext->present)
- continue;
- if (i < builtin_num) {
- context = ext_defs[i].context;
- } else {
- custom_ext_method *meth = NULL;
- meth = custom_ext_find(&s->cert->custext, role, thisext->type,
- &offset);
- if (!ossl_assert(meth != NULL))
- return 0;
- context = meth->context;
- }
- if (!validate_context(s, context, thisctx))
- return 0;
- }
- return 1;
- }
- /*
- * Verify whether we are allowed to use the extension |type| in the current
- * |context|. Returns 1 to indicate the extension is allowed or unknown or 0 to
- * indicate the extension is not allowed. If returning 1 then |*found| is set to
- * the definition for the extension we found.
- */
- static int verify_extension(SSL_CONNECTION *s, unsigned int context,
- unsigned int type, custom_ext_methods *meths,
- RAW_EXTENSION *rawexlist, RAW_EXTENSION **found)
- {
- size_t i;
- size_t builtin_num = OSSL_NELEM(ext_defs);
- const EXTENSION_DEFINITION *thisext;
- for (i = 0, thisext = ext_defs; i < builtin_num; i++, thisext++) {
- if (type == thisext->type) {
- if (!validate_context(s, thisext->context, context))
- return 0;
- *found = &rawexlist[i];
- return 1;
- }
- }
- /* Check the custom extensions */
- if (meths != NULL) {
- size_t offset = 0;
- ENDPOINT role = ENDPOINT_BOTH;
- custom_ext_method *meth = NULL;
- if ((context & SSL_EXT_CLIENT_HELLO) != 0)
- role = ENDPOINT_SERVER;
- else if ((context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0)
- role = ENDPOINT_CLIENT;
- meth = custom_ext_find(meths, role, type, &offset);
- if (meth != NULL) {
- if (!validate_context(s, meth->context, context))
- return 0;
- *found = &rawexlist[offset + builtin_num];
- return 1;
- }
- }
- /* Unknown extension. We allow it */
- *found = NULL;
- return 1;
- }
- /*
- * Check whether the context defined for an extension |extctx| means whether
- * the extension is relevant for the current context |thisctx| or not. Returns
- * 1 if the extension is relevant for this context, and 0 otherwise
- */
- int extension_is_relevant(SSL_CONNECTION *s, unsigned int extctx,
- unsigned int thisctx)
- {
- int is_tls13;
- /*
- * For HRR we haven't selected the version yet but we know it will be
- * TLSv1.3
- */
- if ((thisctx & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0)
- is_tls13 = 1;
- else
- is_tls13 = SSL_CONNECTION_IS_TLS13(s);
- if ((SSL_CONNECTION_IS_DTLS(s)
- && (extctx & SSL_EXT_TLS_IMPLEMENTATION_ONLY) != 0)
- || (s->version == SSL3_VERSION
- && (extctx & SSL_EXT_SSL3_ALLOWED) == 0)
- /*
- * Note that SSL_IS_TLS13() means "TLS 1.3 has been negotiated",
- * which is never true when generating the ClientHello.
- * However, version negotiation *has* occurred by the time the
- * ClientHello extensions are being parsed.
- * Be careful to allow TLS 1.3-only extensions when generating
- * the ClientHello.
- */
- || (is_tls13 && (extctx & SSL_EXT_TLS1_2_AND_BELOW_ONLY) != 0)
- || (!is_tls13 && (extctx & SSL_EXT_TLS1_3_ONLY) != 0
- && (thisctx & SSL_EXT_CLIENT_HELLO) == 0)
- || (s->server && !is_tls13 && (extctx & SSL_EXT_TLS1_3_ONLY) != 0)
- || (s->hit && (extctx & SSL_EXT_IGNORE_ON_RESUMPTION) != 0))
- return 0;
- return 1;
- }
- /*
- * Gather a list of all the extensions from the data in |packet]. |context|
- * tells us which message this extension is for. The raw extension data is
- * stored in |*res| on success. We don't actually process the content of the
- * extensions yet, except to check their types. This function also runs the
- * initialiser functions for all known extensions if |init| is nonzero (whether
- * we have collected them or not). If successful the caller is responsible for
- * freeing the contents of |*res|.
- *
- * Per http://tools.ietf.org/html/rfc5246#section-7.4.1.4, there may not be
- * more than one extension of the same type in a ClientHello or ServerHello.
- * This function returns 1 if all extensions are unique and we have parsed their
- * types, and 0 if the extensions contain duplicates, could not be successfully
- * found, or an internal error occurred. We only check duplicates for
- * extensions that we know about. We ignore others.
- */
- int tls_collect_extensions(SSL_CONNECTION *s, PACKET *packet,
- unsigned int context,
- RAW_EXTENSION **res, size_t *len, int init)
- {
- PACKET extensions = *packet;
- size_t i = 0;
- size_t num_exts;
- custom_ext_methods *exts = &s->cert->custext;
- RAW_EXTENSION *raw_extensions = NULL;
- const EXTENSION_DEFINITION *thisexd;
- *res = NULL;
- /*
- * Initialise server side custom extensions. Client side is done during
- * construction of extensions for the ClientHello.
- */
- if ((context & SSL_EXT_CLIENT_HELLO) != 0)
- custom_ext_init(&s->cert->custext);
- num_exts = OSSL_NELEM(ext_defs) + (exts != NULL ? exts->meths_count : 0);
- raw_extensions = OPENSSL_zalloc(num_exts * sizeof(*raw_extensions));
- if (raw_extensions == NULL) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_CRYPTO_LIB);
- return 0;
- }
- i = 0;
- while (PACKET_remaining(&extensions) > 0) {
- unsigned int type, idx;
- PACKET extension;
- RAW_EXTENSION *thisex;
- if (!PACKET_get_net_2(&extensions, &type) ||
- !PACKET_get_length_prefixed_2(&extensions, &extension)) {
- SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_EXTENSION);
- goto err;
- }
- /*
- * Verify this extension is allowed. We only check duplicates for
- * extensions that we recognise. We also have a special case for the
- * PSK extension, which must be the last one in the ClientHello.
- */
- if (!verify_extension(s, context, type, exts, raw_extensions, &thisex)
- || (thisex != NULL && thisex->present == 1)
- || (type == TLSEXT_TYPE_psk
- && (context & SSL_EXT_CLIENT_HELLO) != 0
- && PACKET_remaining(&extensions) != 0)) {
- SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_EXTENSION);
- goto err;
- }
- idx = thisex - raw_extensions;
- /*-
- * Check that we requested this extension (if appropriate). Requests can
- * be sent in the ClientHello and CertificateRequest. Unsolicited
- * extensions can be sent in the NewSessionTicket. We only do this for
- * the built-in extensions. Custom extensions have a different but
- * similar check elsewhere.
- * Special cases:
- * - The HRR cookie extension is unsolicited
- * - The renegotiate extension is unsolicited (the client signals
- * support via an SCSV)
- * - The signed_certificate_timestamp extension can be provided by a
- * custom extension or by the built-in version. We let the extension
- * itself handle unsolicited response checks.
- */
- if (idx < OSSL_NELEM(ext_defs)
- && (context & (SSL_EXT_CLIENT_HELLO
- | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST
- | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) == 0
- && type != TLSEXT_TYPE_cookie
- && type != TLSEXT_TYPE_renegotiate
- && type != TLSEXT_TYPE_signed_certificate_timestamp
- && (s->ext.extflags[idx] & SSL_EXT_FLAG_SENT) == 0
- #ifndef OPENSSL_NO_GOST
- && !((context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0
- && type == TLSEXT_TYPE_cryptopro_bug)
- #endif
- ) {
- SSLfatal(s, SSL_AD_UNSUPPORTED_EXTENSION,
- SSL_R_UNSOLICITED_EXTENSION);
- goto err;
- }
- if (thisex != NULL) {
- thisex->data = extension;
- thisex->present = 1;
- thisex->type = type;
- thisex->received_order = i++;
- if (s->ext.debug_cb)
- s->ext.debug_cb(SSL_CONNECTION_GET_SSL(s), !s->server,
- thisex->type, PACKET_data(&thisex->data),
- PACKET_remaining(&thisex->data),
- s->ext.debug_arg);
- }
- }
- if (init) {
- /*
- * Initialise all known extensions relevant to this context,
- * whether we have found them or not
- */
- for (thisexd = ext_defs, i = 0; i < OSSL_NELEM(ext_defs);
- i++, thisexd++) {
- if (thisexd->init != NULL && (thisexd->context & context) != 0
- && extension_is_relevant(s, thisexd->context, context)
- && !thisexd->init(s, context)) {
- /* SSLfatal() already called */
- goto err;
- }
- }
- }
- *res = raw_extensions;
- if (len != NULL)
- *len = num_exts;
- return 1;
- err:
- OPENSSL_free(raw_extensions);
- return 0;
- }
- /*
- * Runs the parser for a given extension with index |idx|. |exts| contains the
- * list of all parsed extensions previously collected by
- * tls_collect_extensions(). The parser is only run if it is applicable for the
- * given |context| and the parser has not already been run. If this is for a
- * Certificate message, then we also provide the parser with the relevant
- * Certificate |x| and its position in the |chainidx| with 0 being the first
- * Certificate. Returns 1 on success or 0 on failure. If an extension is not
- * present this counted as success.
- */
- int tls_parse_extension(SSL_CONNECTION *s, TLSEXT_INDEX idx, int context,
- RAW_EXTENSION *exts, X509 *x, size_t chainidx)
- {
- RAW_EXTENSION *currext = &exts[idx];
- int (*parser)(SSL_CONNECTION *s, PACKET *pkt, unsigned int context, X509 *x,
- size_t chainidx) = NULL;
- /* Skip if the extension is not present */
- if (!currext->present)
- return 1;
- /* Skip if we've already parsed this extension */
- if (currext->parsed)
- return 1;
- currext->parsed = 1;
- if (idx < OSSL_NELEM(ext_defs)) {
- /* We are handling a built-in extension */
- const EXTENSION_DEFINITION *extdef = &ext_defs[idx];
- /* Check if extension is defined for our protocol. If not, skip */
- if (!extension_is_relevant(s, extdef->context, context))
- return 1;
- parser = s->server ? extdef->parse_ctos : extdef->parse_stoc;
- if (parser != NULL)
- return parser(s, &currext->data, context, x, chainidx);
- /*
- * If the parser is NULL we fall through to the custom extension
- * processing
- */
- }
- /* Parse custom extensions */
- return custom_ext_parse(s, context, currext->type,
- PACKET_data(&currext->data),
- PACKET_remaining(&currext->data),
- x, chainidx);
- }
- /*
- * Parse all remaining extensions that have not yet been parsed. Also calls the
- * finalisation for all extensions at the end if |fin| is nonzero, whether we
- * collected them or not. Returns 1 for success or 0 for failure. If we are
- * working on a Certificate message then we also pass the Certificate |x| and
- * its position in the |chainidx|, with 0 being the first certificate.
- */
- int tls_parse_all_extensions(SSL_CONNECTION *s, int context,
- RAW_EXTENSION *exts, X509 *x,
- size_t chainidx, int fin)
- {
- size_t i, numexts = OSSL_NELEM(ext_defs);
- const EXTENSION_DEFINITION *thisexd;
- /* Calculate the number of extensions in the extensions list */
- numexts += s->cert->custext.meths_count;
- /* Parse each extension in turn */
- for (i = 0; i < numexts; i++) {
- if (!tls_parse_extension(s, i, context, exts, x, chainidx)) {
- /* SSLfatal() already called */
- return 0;
- }
- }
- if (fin) {
- /*
- * Finalise all known extensions relevant to this context,
- * whether we have found them or not
- */
- for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs);
- i++, thisexd++) {
- if (thisexd->final != NULL && (thisexd->context & context) != 0
- && !thisexd->final(s, context, exts[i].present)) {
- /* SSLfatal() already called */
- return 0;
- }
- }
- }
- return 1;
- }
- int should_add_extension(SSL_CONNECTION *s, unsigned int extctx,
- unsigned int thisctx, int max_version)
- {
- /* Skip if not relevant for our context */
- if ((extctx & thisctx) == 0)
- return 0;
- /* Check if this extension is defined for our protocol. If not, skip */
- if (!extension_is_relevant(s, extctx, thisctx)
- || ((extctx & SSL_EXT_TLS1_3_ONLY) != 0
- && (thisctx & SSL_EXT_CLIENT_HELLO) != 0
- && (SSL_CONNECTION_IS_DTLS(s) || max_version < TLS1_3_VERSION)))
- return 0;
- return 1;
- }
- /*
- * Construct all the extensions relevant to the current |context| and write
- * them to |pkt|. If this is an extension for a Certificate in a Certificate
- * message, then |x| will be set to the Certificate we are handling, and
- * |chainidx| will indicate the position in the chainidx we are processing (with
- * 0 being the first in the chain). Returns 1 on success or 0 on failure. On a
- * failure construction stops at the first extension to fail to construct.
- */
- int tls_construct_extensions(SSL_CONNECTION *s, WPACKET *pkt,
- unsigned int context,
- X509 *x, size_t chainidx)
- {
- size_t i;
- int min_version, max_version = 0, reason;
- const EXTENSION_DEFINITION *thisexd;
- int for_comp = (context & SSL_EXT_TLS1_3_CERTIFICATE_COMPRESSION) != 0;
- if (!WPACKET_start_sub_packet_u16(pkt)
- /*
- * If extensions are of zero length then we don't even add the
- * extensions length bytes to a ClientHello/ServerHello
- * (for non-TLSv1.3).
- */
- || ((context &
- (SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO)) != 0
- && !WPACKET_set_flags(pkt,
- WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH))) {
- if (!for_comp)
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- if ((context & SSL_EXT_CLIENT_HELLO) != 0) {
- reason = ssl_get_min_max_version(s, &min_version, &max_version, NULL);
- if (reason != 0) {
- if (!for_comp)
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, reason);
- return 0;
- }
- }
- /* Add custom extensions first */
- if ((context & SSL_EXT_CLIENT_HELLO) != 0) {
- /* On the server side with initialise during ClientHello parsing */
- custom_ext_init(&s->cert->custext);
- }
- if (!custom_ext_add(s, context, pkt, x, chainidx, max_version)) {
- /* SSLfatal() already called */
- return 0;
- }
- for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); i++, thisexd++) {
- EXT_RETURN (*construct)(SSL_CONNECTION *s, WPACKET *pkt,
- unsigned int context,
- X509 *x, size_t chainidx);
- EXT_RETURN ret;
- /* Skip if not relevant for our context */
- if (!should_add_extension(s, thisexd->context, context, max_version))
- continue;
- construct = s->server ? thisexd->construct_stoc
- : thisexd->construct_ctos;
- if (construct == NULL)
- continue;
- ret = construct(s, pkt, context, x, chainidx);
- if (ret == EXT_RETURN_FAIL) {
- /* SSLfatal() already called */
- return 0;
- }
- if (ret == EXT_RETURN_SENT
- && (context & (SSL_EXT_CLIENT_HELLO
- | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST
- | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) != 0)
- s->ext.extflags[i] |= SSL_EXT_FLAG_SENT;
- }
- if (!WPACKET_close(pkt)) {
- if (!for_comp)
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- return 1;
- }
- /*
- * Built in extension finalisation and initialisation functions. All initialise
- * or finalise the associated extension type for the given |context|. For
- * finalisers |sent| is set to 1 if we saw the extension during parsing, and 0
- * otherwise. These functions return 1 on success or 0 on failure.
- */
- static int final_renegotiate(SSL_CONNECTION *s, unsigned int context, int sent)
- {
- if (!s->server) {
- /*
- * Check if we can connect to a server that doesn't support safe
- * renegotiation
- */
- if (!(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
- && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)
- && !sent) {
- SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
- SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
- return 0;
- }
- return 1;
- }
- /* Need RI if renegotiating */
- if (s->renegotiate
- && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)
- && !sent) {
- SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
- SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
- return 0;
- }
- return 1;
- }
- static ossl_inline void ssl_tsan_decr(const SSL_CTX *ctx,
- TSAN_QUALIFIER int *stat)
- {
- if (ssl_tsan_lock(ctx)) {
- tsan_decr(stat);
- ssl_tsan_unlock(ctx);
- }
- }
- static int init_server_name(SSL_CONNECTION *s, unsigned int context)
- {
- if (s->server) {
- s->servername_done = 0;
- OPENSSL_free(s->ext.hostname);
- s->ext.hostname = NULL;
- }
- return 1;
- }
- static int final_server_name(SSL_CONNECTION *s, unsigned int context, int sent)
- {
- int ret = SSL_TLSEXT_ERR_NOACK;
- int altmp = SSL_AD_UNRECOGNIZED_NAME;
- SSL *ssl = SSL_CONNECTION_GET_SSL(s);
- SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
- int was_ticket = (SSL_get_options(ssl) & SSL_OP_NO_TICKET) == 0;
- if (!ossl_assert(sctx != NULL) || !ossl_assert(s->session_ctx != NULL)) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- if (sctx->ext.servername_cb != NULL)
- ret = sctx->ext.servername_cb(ssl, &altmp,
- sctx->ext.servername_arg);
- else if (s->session_ctx->ext.servername_cb != NULL)
- ret = s->session_ctx->ext.servername_cb(ssl, &altmp,
- s->session_ctx->ext.servername_arg);
- /*
- * For servers, propagate the SNI hostname from the temporary
- * storage in the SSL to the persistent SSL_SESSION, now that we
- * know we accepted it.
- * Clients make this copy when parsing the server's response to
- * the extension, which is when they find out that the negotiation
- * was successful.
- */
- if (s->server) {
- if (sent && ret == SSL_TLSEXT_ERR_OK && !s->hit) {
- /* Only store the hostname in the session if we accepted it. */
- OPENSSL_free(s->session->ext.hostname);
- s->session->ext.hostname = OPENSSL_strdup(s->ext.hostname);
- if (s->session->ext.hostname == NULL && s->ext.hostname != NULL) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- }
- }
- }
- /*
- * If we switched contexts (whether here or in the client_hello callback),
- * move the sess_accept increment from the session_ctx to the new
- * context, to avoid the confusing situation of having sess_accept_good
- * exceed sess_accept (zero) for the new context.
- */
- if (SSL_IS_FIRST_HANDSHAKE(s) && sctx != s->session_ctx
- && s->hello_retry_request == SSL_HRR_NONE) {
- ssl_tsan_counter(sctx, &sctx->stats.sess_accept);
- ssl_tsan_decr(s->session_ctx, &s->session_ctx->stats.sess_accept);
- }
- /*
- * If we're expecting to send a ticket, and tickets were previously enabled,
- * and now tickets are disabled, then turn off expected ticket.
- * Also, if this is not a resumption, create a new session ID
- */
- if (ret == SSL_TLSEXT_ERR_OK && s->ext.ticket_expected
- && was_ticket && (SSL_get_options(ssl) & SSL_OP_NO_TICKET) != 0) {
- s->ext.ticket_expected = 0;
- if (!s->hit) {
- SSL_SESSION* ss = SSL_get_session(ssl);
- if (ss != NULL) {
- OPENSSL_free(ss->ext.tick);
- ss->ext.tick = NULL;
- ss->ext.ticklen = 0;
- ss->ext.tick_lifetime_hint = 0;
- ss->ext.tick_age_add = 0;
- if (!ssl_generate_session_id(s, ss)) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- } else {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- }
- }
- switch (ret) {
- case SSL_TLSEXT_ERR_ALERT_FATAL:
- SSLfatal(s, altmp, SSL_R_CALLBACK_FAILED);
- return 0;
- case SSL_TLSEXT_ERR_ALERT_WARNING:
- /* TLSv1.3 doesn't have warning alerts so we suppress this */
- if (!SSL_CONNECTION_IS_TLS13(s))
- ssl3_send_alert(s, SSL3_AL_WARNING, altmp);
- s->servername_done = 0;
- return 1;
- case SSL_TLSEXT_ERR_NOACK:
- s->servername_done = 0;
- return 1;
- default:
- return 1;
- }
- }
- static int final_ec_pt_formats(SSL_CONNECTION *s, unsigned int context,
- int sent)
- {
- unsigned long alg_k, alg_a;
- if (s->server)
- return 1;
- alg_k = s->s3.tmp.new_cipher->algorithm_mkey;
- alg_a = s->s3.tmp.new_cipher->algorithm_auth;
- /*
- * If we are client and using an elliptic curve cryptography cipher
- * suite, then if server returns an EC point formats lists extension it
- * must contain uncompressed.
- */
- if (s->ext.ecpointformats != NULL
- && s->ext.ecpointformats_len > 0
- && s->ext.peer_ecpointformats != NULL
- && s->ext.peer_ecpointformats_len > 0
- && ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA))) {
- /* we are using an ECC cipher */
- size_t i;
- unsigned char *list = s->ext.peer_ecpointformats;
- for (i = 0; i < s->ext.peer_ecpointformats_len; i++) {
- if (*list++ == TLSEXT_ECPOINTFORMAT_uncompressed)
- break;
- }
- if (i == s->ext.peer_ecpointformats_len) {
- SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
- SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
- return 0;
- }
- }
- return 1;
- }
- static int init_session_ticket(SSL_CONNECTION *s, unsigned int context)
- {
- if (!s->server)
- s->ext.ticket_expected = 0;
- return 1;
- }
- #ifndef OPENSSL_NO_OCSP
- static int init_status_request(SSL_CONNECTION *s, unsigned int context)
- {
- if (s->server) {
- s->ext.status_type = TLSEXT_STATUSTYPE_nothing;
- } else {
- /*
- * Ensure we get sensible values passed to tlsext_status_cb in the event
- * that we don't receive a status message
- */
- OPENSSL_free(s->ext.ocsp.resp);
- s->ext.ocsp.resp = NULL;
- s->ext.ocsp.resp_len = 0;
- }
- return 1;
- }
- #endif
- #ifndef OPENSSL_NO_NEXTPROTONEG
- static int init_npn(SSL_CONNECTION *s, unsigned int context)
- {
- s->s3.npn_seen = 0;
- return 1;
- }
- #endif
- static int init_alpn(SSL_CONNECTION *s, unsigned int context)
- {
- OPENSSL_free(s->s3.alpn_selected);
- s->s3.alpn_selected = NULL;
- s->s3.alpn_selected_len = 0;
- if (s->server) {
- OPENSSL_free(s->s3.alpn_proposed);
- s->s3.alpn_proposed = NULL;
- s->s3.alpn_proposed_len = 0;
- }
- return 1;
- }
- static int final_alpn(SSL_CONNECTION *s, unsigned int context, int sent)
- {
- if (!s->server && !sent && s->session->ext.alpn_selected != NULL)
- s->ext.early_data_ok = 0;
- if (!s->server || !SSL_CONNECTION_IS_TLS13(s))
- return 1;
- /*
- * Call alpn_select callback if needed. Has to be done after SNI and
- * cipher negotiation (HTTP/2 restricts permitted ciphers). In TLSv1.3
- * we also have to do this before we decide whether to accept early_data.
- * In TLSv1.3 we've already negotiated our cipher so we do this call now.
- * For < TLSv1.3 we defer it until after cipher negotiation.
- *
- * On failure SSLfatal() already called.
- */
- return tls_handle_alpn(s);
- }
- static int init_sig_algs(SSL_CONNECTION *s, unsigned int context)
- {
- /* Clear any signature algorithms extension received */
- OPENSSL_free(s->s3.tmp.peer_sigalgs);
- s->s3.tmp.peer_sigalgs = NULL;
- s->s3.tmp.peer_sigalgslen = 0;
- return 1;
- }
- static int init_sig_algs_cert(SSL_CONNECTION *s,
- ossl_unused unsigned int context)
- {
- /* Clear any signature algorithms extension received */
- OPENSSL_free(s->s3.tmp.peer_cert_sigalgs);
- s->s3.tmp.peer_cert_sigalgs = NULL;
- s->s3.tmp.peer_cert_sigalgslen = 0;
- return 1;
- }
- #ifndef OPENSSL_NO_SRP
- static int init_srp(SSL_CONNECTION *s, unsigned int context)
- {
- OPENSSL_free(s->srp_ctx.login);
- s->srp_ctx.login = NULL;
- return 1;
- }
- #endif
- static int init_ec_point_formats(SSL_CONNECTION *s, unsigned int context)
- {
- OPENSSL_free(s->ext.peer_ecpointformats);
- s->ext.peer_ecpointformats = NULL;
- s->ext.peer_ecpointformats_len = 0;
- return 1;
- }
- static int init_etm(SSL_CONNECTION *s, unsigned int context)
- {
- s->ext.use_etm = 0;
- return 1;
- }
- static int init_ems(SSL_CONNECTION *s, unsigned int context)
- {
- if (s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) {
- s->s3.flags &= ~TLS1_FLAGS_RECEIVED_EXTMS;
- s->s3.flags |= TLS1_FLAGS_REQUIRED_EXTMS;
- }
- return 1;
- }
- static int final_ems(SSL_CONNECTION *s, unsigned int context, int sent)
- {
- /*
- * Check extended master secret extension is not dropped on
- * renegotiation.
- */
- if (!(s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS)
- && (s->s3.flags & TLS1_FLAGS_REQUIRED_EXTMS)) {
- SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_INCONSISTENT_EXTMS);
- return 0;
- }
- if (!s->server && s->hit) {
- /*
- * Check extended master secret extension is consistent with
- * original session.
- */
- if (!(s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) !=
- !(s->session->flags & SSL_SESS_FLAG_EXTMS)) {
- SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_INCONSISTENT_EXTMS);
- return 0;
- }
- }
- return 1;
- }
- static int init_certificate_authorities(SSL_CONNECTION *s, unsigned int context)
- {
- sk_X509_NAME_pop_free(s->s3.tmp.peer_ca_names, X509_NAME_free);
- s->s3.tmp.peer_ca_names = NULL;
- return 1;
- }
- static EXT_RETURN tls_construct_certificate_authorities(SSL_CONNECTION *s,
- WPACKET *pkt,
- unsigned int context,
- X509 *x,
- size_t chainidx)
- {
- const STACK_OF(X509_NAME) *ca_sk = get_ca_names(s);
- if (ca_sk == NULL || sk_X509_NAME_num(ca_sk) == 0)
- return EXT_RETURN_NOT_SENT;
- if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_certificate_authorities)
- || !WPACKET_start_sub_packet_u16(pkt)) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return EXT_RETURN_FAIL;
- }
- if (!construct_ca_names(s, ca_sk, pkt)) {
- /* SSLfatal() already called */
- return EXT_RETURN_FAIL;
- }
- if (!WPACKET_close(pkt)) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return EXT_RETURN_FAIL;
- }
- return EXT_RETURN_SENT;
- }
- static int tls_parse_certificate_authorities(SSL_CONNECTION *s, PACKET *pkt,
- unsigned int context, X509 *x,
- size_t chainidx)
- {
- if (!parse_ca_names(s, pkt))
- return 0;
- if (PACKET_remaining(pkt) != 0) {
- SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_EXTENSION);
- return 0;
- }
- return 1;
- }
- #ifndef OPENSSL_NO_SRTP
- static int init_srtp(SSL_CONNECTION *s, unsigned int context)
- {
- if (s->server)
- s->srtp_profile = NULL;
- return 1;
- }
- #endif
- static int final_sig_algs(SSL_CONNECTION *s, unsigned int context, int sent)
- {
- if (!sent && SSL_CONNECTION_IS_TLS13(s) && !s->hit) {
- SSLfatal(s, TLS13_AD_MISSING_EXTENSION,
- SSL_R_MISSING_SIGALGS_EXTENSION);
- return 0;
- }
- return 1;
- }
- static int final_key_share(SSL_CONNECTION *s, unsigned int context, int sent)
- {
- #if !defined(OPENSSL_NO_TLS1_3)
- if (!SSL_CONNECTION_IS_TLS13(s))
- return 1;
- /* Nothing to do for key_share in an HRR */
- if ((context & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0)
- return 1;
- /*
- * If
- * we are a client
- * AND
- * we have no key_share
- * AND
- * (we are not resuming
- * OR the kex_mode doesn't allow non key_share resumes)
- * THEN
- * fail;
- */
- if (!s->server
- && !sent
- && (!s->hit
- || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0)) {
- /* Nothing left we can do - just fail */
- SSLfatal(s, SSL_AD_MISSING_EXTENSION, SSL_R_NO_SUITABLE_KEY_SHARE);
- return 0;
- }
- /*
- * IF
- * we are a server
- * THEN
- * IF
- * we have a suitable key_share
- * THEN
- * IF
- * we are stateless AND we have no cookie
- * THEN
- * send a HelloRetryRequest
- * ELSE
- * IF
- * we didn't already send a HelloRetryRequest
- * AND
- * the client sent a key_share extension
- * AND
- * (we are not resuming
- * OR the kex_mode allows key_share resumes)
- * AND
- * a shared group exists
- * THEN
- * send a HelloRetryRequest
- * ELSE IF
- * we are not resuming
- * OR
- * the kex_mode doesn't allow non key_share resumes
- * THEN
- * fail
- * ELSE IF
- * we are stateless AND we have no cookie
- * THEN
- * send a HelloRetryRequest
- */
- if (s->server) {
- if (s->s3.peer_tmp != NULL) {
- /* We have a suitable key_share */
- if ((s->s3.flags & TLS1_FLAGS_STATELESS) != 0
- && !s->ext.cookieok) {
- if (!ossl_assert(s->hello_retry_request == SSL_HRR_NONE)) {
- /*
- * If we are stateless then we wouldn't know about any
- * previously sent HRR - so how can this be anything other
- * than 0?
- */
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- s->hello_retry_request = SSL_HRR_PENDING;
- return 1;
- }
- } else {
- /* No suitable key_share */
- if (s->hello_retry_request == SSL_HRR_NONE && sent
- && (!s->hit
- || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE_DHE)
- != 0)) {
- const uint16_t *pgroups, *clntgroups;
- size_t num_groups, clnt_num_groups, i;
- unsigned int group_id = 0;
- /* Check if a shared group exists */
- /* Get the clients list of supported groups. */
- tls1_get_peer_groups(s, &clntgroups, &clnt_num_groups);
- tls1_get_supported_groups(s, &pgroups, &num_groups);
- /*
- * Find the first group we allow that is also in client's list
- */
- for (i = 0; i < num_groups; i++) {
- group_id = pgroups[i];
- if (check_in_list(s, group_id, clntgroups, clnt_num_groups,
- 1)
- && tls_group_allowed(s, group_id,
- SSL_SECOP_CURVE_SUPPORTED)
- && tls_valid_group(s, group_id, TLS1_3_VERSION,
- TLS1_3_VERSION, 0, NULL))
- break;
- }
- if (i < num_groups) {
- /* A shared group exists so send a HelloRetryRequest */
- s->s3.group_id = group_id;
- s->hello_retry_request = SSL_HRR_PENDING;
- return 1;
- }
- }
- if (!s->hit
- || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0) {
- /* Nothing left we can do - just fail */
- SSLfatal(s, sent ? SSL_AD_HANDSHAKE_FAILURE
- : SSL_AD_MISSING_EXTENSION,
- SSL_R_NO_SUITABLE_KEY_SHARE);
- return 0;
- }
- if ((s->s3.flags & TLS1_FLAGS_STATELESS) != 0
- && !s->ext.cookieok) {
- if (!ossl_assert(s->hello_retry_request == SSL_HRR_NONE)) {
- /*
- * If we are stateless then we wouldn't know about any
- * previously sent HRR - so how can this be anything other
- * than 0?
- */
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- s->hello_retry_request = SSL_HRR_PENDING;
- return 1;
- }
- }
- /*
- * We have a key_share so don't send any more HelloRetryRequest
- * messages
- */
- if (s->hello_retry_request == SSL_HRR_PENDING)
- s->hello_retry_request = SSL_HRR_COMPLETE;
- } else {
- /*
- * For a client side resumption with no key_share we need to generate
- * the handshake secret (otherwise this is done during key_share
- * processing).
- */
- if (!sent && !tls13_generate_handshake_secret(s, NULL, 0)) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- }
- #endif /* !defined(OPENSSL_NO_TLS1_3) */
- return 1;
- }
- static int init_psk_kex_modes(SSL_CONNECTION *s, unsigned int context)
- {
- s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_NONE;
- return 1;
- }
- int tls_psk_do_binder(SSL_CONNECTION *s, const EVP_MD *md,
- const unsigned char *msgstart,
- size_t binderoffset, const unsigned char *binderin,
- unsigned char *binderout, SSL_SESSION *sess, int sign,
- int external)
- {
- EVP_PKEY *mackey = NULL;
- EVP_MD_CTX *mctx = NULL;
- unsigned char hash[EVP_MAX_MD_SIZE], binderkey[EVP_MAX_MD_SIZE];
- unsigned char finishedkey[EVP_MAX_MD_SIZE], tmpbinder[EVP_MAX_MD_SIZE];
- unsigned char *early_secret;
- /* ASCII: "res binder", in hex for EBCDIC compatibility */
- static const unsigned char resumption_label[] = "\x72\x65\x73\x20\x62\x69\x6E\x64\x65\x72";
- /* ASCII: "ext binder", in hex for EBCDIC compatibility */
- static const unsigned char external_label[] = "\x65\x78\x74\x20\x62\x69\x6E\x64\x65\x72";
- const unsigned char *label;
- size_t bindersize, labelsize, hashsize;
- int hashsizei = EVP_MD_get_size(md);
- int ret = -1;
- int usepskfored = 0;
- SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
- /* Ensure cast to size_t is safe */
- if (!ossl_assert(hashsizei >= 0)) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- goto err;
- }
- hashsize = (size_t)hashsizei;
- if (external
- && s->early_data_state == SSL_EARLY_DATA_CONNECTING
- && s->session->ext.max_early_data == 0
- && sess->ext.max_early_data > 0)
- usepskfored = 1;
- if (external) {
- label = external_label;
- labelsize = sizeof(external_label) - 1;
- } else {
- label = resumption_label;
- labelsize = sizeof(resumption_label) - 1;
- }
- /*
- * Generate the early_secret. On the server side we've selected a PSK to
- * resume with (internal or external) so we always do this. On the client
- * side we do this for a non-external (i.e. resumption) PSK or external PSK
- * that will be used for early_data so that it is in place for sending early
- * data. For client side external PSK not being used for early_data we
- * generate it but store it away for later use.
- */
- if (s->server || !external || usepskfored)
- early_secret = (unsigned char *)s->early_secret;
- else
- early_secret = (unsigned char *)sess->early_secret;
- if (!tls13_generate_secret(s, md, NULL, sess->master_key,
- sess->master_key_length, early_secret)) {
- /* SSLfatal() already called */
- goto err;
- }
- /*
- * Create the handshake hash for the binder key...the messages so far are
- * empty!
- */
- mctx = EVP_MD_CTX_new();
- if (mctx == NULL
- || EVP_DigestInit_ex(mctx, md, NULL) <= 0
- || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- goto err;
- }
- /* Generate the binder key */
- if (!tls13_hkdf_expand(s, md, early_secret, label, labelsize, hash,
- hashsize, binderkey, hashsize, 1)) {
- /* SSLfatal() already called */
- goto err;
- }
- /* Generate the finished key */
- if (!tls13_derive_finishedkey(s, md, binderkey, finishedkey, hashsize)) {
- /* SSLfatal() already called */
- goto err;
- }
- if (EVP_DigestInit_ex(mctx, md, NULL) <= 0) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- goto err;
- }
- /*
- * Get a hash of the ClientHello up to the start of the binders. If we are
- * following a HelloRetryRequest then this includes the hash of the first
- * ClientHello and the HelloRetryRequest itself.
- */
- if (s->hello_retry_request == SSL_HRR_PENDING) {
- size_t hdatalen;
- long hdatalen_l;
- void *hdata;
- hdatalen = hdatalen_l =
- BIO_get_mem_data(s->s3.handshake_buffer, &hdata);
- if (hdatalen_l <= 0) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_LENGTH);
- goto err;
- }
- /*
- * For servers the handshake buffer data will include the second
- * ClientHello - which we don't want - so we need to take that bit off.
- */
- if (s->server) {
- PACKET hashprefix, msg;
- /* Find how many bytes are left after the first two messages */
- if (!PACKET_buf_init(&hashprefix, hdata, hdatalen)
- || !PACKET_forward(&hashprefix, 1)
- || !PACKET_get_length_prefixed_3(&hashprefix, &msg)
- || !PACKET_forward(&hashprefix, 1)
- || !PACKET_get_length_prefixed_3(&hashprefix, &msg)) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- goto err;
- }
- hdatalen -= PACKET_remaining(&hashprefix);
- }
- if (EVP_DigestUpdate(mctx, hdata, hdatalen) <= 0) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- goto err;
- }
- }
- if (EVP_DigestUpdate(mctx, msgstart, binderoffset) <= 0
- || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- goto err;
- }
- mackey = EVP_PKEY_new_raw_private_key_ex(sctx->libctx, "HMAC",
- sctx->propq, finishedkey,
- hashsize);
- if (mackey == NULL) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- goto err;
- }
- if (!sign)
- binderout = tmpbinder;
- bindersize = hashsize;
- if (EVP_DigestSignInit_ex(mctx, NULL, EVP_MD_get0_name(md), sctx->libctx,
- sctx->propq, mackey, NULL) <= 0
- || EVP_DigestSignUpdate(mctx, hash, hashsize) <= 0
- || EVP_DigestSignFinal(mctx, binderout, &bindersize) <= 0
- || bindersize != hashsize) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- goto err;
- }
- if (sign) {
- ret = 1;
- } else {
- /* HMAC keys can't do EVP_DigestVerify* - use CRYPTO_memcmp instead */
- ret = (CRYPTO_memcmp(binderin, binderout, hashsize) == 0);
- if (!ret)
- SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BINDER_DOES_NOT_VERIFY);
- }
- err:
- OPENSSL_cleanse(binderkey, sizeof(binderkey));
- OPENSSL_cleanse(finishedkey, sizeof(finishedkey));
- EVP_PKEY_free(mackey);
- EVP_MD_CTX_free(mctx);
- return ret;
- }
- static int final_early_data(SSL_CONNECTION *s, unsigned int context, int sent)
- {
- if (!sent)
- return 1;
- if (!s->server) {
- if (context == SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS
- && sent
- && !s->ext.early_data_ok) {
- /*
- * If we get here then the server accepted our early_data but we
- * later realised that it shouldn't have done (e.g. inconsistent
- * ALPN)
- */
- SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_EARLY_DATA);
- return 0;
- }
- return 1;
- }
- if (s->max_early_data == 0
- || !s->hit
- || s->early_data_state != SSL_EARLY_DATA_ACCEPTING
- || !s->ext.early_data_ok
- || s->hello_retry_request != SSL_HRR_NONE
- || (s->allow_early_data_cb != NULL
- && !s->allow_early_data_cb(SSL_CONNECTION_GET_SSL(s),
- s->allow_early_data_cb_data))) {
- s->ext.early_data = SSL_EARLY_DATA_REJECTED;
- } else {
- s->ext.early_data = SSL_EARLY_DATA_ACCEPTED;
- if (!tls13_change_cipher_state(s,
- SSL3_CC_EARLY | SSL3_CHANGE_CIPHER_SERVER_READ)) {
- /* SSLfatal() already called */
- return 0;
- }
- }
- return 1;
- }
- static int final_maxfragmentlen(SSL_CONNECTION *s, unsigned int context,
- int sent)
- {
- /*
- * Session resumption on server-side with MFL extension active
- * BUT MFL extension packet was not resent (i.e. sent == 0)
- */
- if (s->server && s->hit && USE_MAX_FRAGMENT_LENGTH_EXT(s->session)
- && !sent ) {
- SSLfatal(s, SSL_AD_MISSING_EXTENSION, SSL_R_BAD_EXTENSION);
- return 0;
- }
- if (s->session && USE_MAX_FRAGMENT_LENGTH_EXT(s->session)) {
- s->rlayer.rrlmethod->set_max_frag_len(s->rlayer.rrl,
- GET_MAX_FRAGMENT_LENGTH(s->session));
- s->rlayer.wrlmethod->set_max_frag_len(s->rlayer.wrl,
- ssl_get_max_send_fragment(s));
- }
- return 1;
- }
- static int init_post_handshake_auth(SSL_CONNECTION *s,
- ossl_unused unsigned int context)
- {
- s->post_handshake_auth = SSL_PHA_NONE;
- return 1;
- }
- /*
- * If clients offer "pre_shared_key" without a "psk_key_exchange_modes"
- * extension, servers MUST abort the handshake.
- */
- static int final_psk(SSL_CONNECTION *s, unsigned int context, int sent)
- {
- if (s->server && sent && s->clienthello != NULL
- && !s->clienthello->pre_proc_exts[TLSEXT_IDX_psk_kex_modes].present) {
- SSLfatal(s, TLS13_AD_MISSING_EXTENSION,
- SSL_R_MISSING_PSK_KEX_MODES_EXTENSION);
- return 0;
- }
- return 1;
- }
- static int tls_init_compress_certificate(SSL_CONNECTION *sc, unsigned int context)
- {
- memset(sc->ext.compress_certificate_from_peer, 0,
- sizeof(sc->ext.compress_certificate_from_peer));
- return 1;
- }
- /* The order these are put into the packet imply a preference order: [brotli, zlib, zstd] */
- static EXT_RETURN tls_construct_compress_certificate(SSL_CONNECTION *sc, WPACKET *pkt,
- unsigned int context,
- X509 *x, size_t chainidx)
- {
- #ifndef OPENSSL_NO_COMP_ALG
- int i;
- if (!ossl_comp_has_alg(0))
- return EXT_RETURN_NOT_SENT;
- /* Server: Don't attempt to compress a non-X509 (i.e. an RPK) */
- if (sc->server && sc->ext.server_cert_type != TLSEXT_cert_type_x509) {
- sc->cert_comp_prefs[0] = TLSEXT_comp_cert_none;
- return EXT_RETURN_NOT_SENT;
- }
- /* Client: If we sent a client cert-type extension, don't indicate compression */
- if (!sc->server && sc->ext.client_cert_type_ctos) {
- sc->cert_comp_prefs[0] = TLSEXT_comp_cert_none;
- return EXT_RETURN_NOT_SENT;
- }
- /* Do not indicate we support receiving compressed certificates */
- if ((sc->options & SSL_OP_NO_RX_CERTIFICATE_COMPRESSION) != 0)
- return EXT_RETURN_NOT_SENT;
- if (sc->cert_comp_prefs[0] == TLSEXT_comp_cert_none)
- return EXT_RETURN_NOT_SENT;
- if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_compress_certificate)
- || !WPACKET_start_sub_packet_u16(pkt)
- || !WPACKET_start_sub_packet_u8(pkt))
- goto err;
- for (i = 0; sc->cert_comp_prefs[i] != TLSEXT_comp_cert_none; i++) {
- if (!WPACKET_put_bytes_u16(pkt, sc->cert_comp_prefs[i]))
- goto err;
- }
- if (!WPACKET_close(pkt) || !WPACKET_close(pkt))
- goto err;
- sc->ext.compress_certificate_sent = 1;
- return EXT_RETURN_SENT;
- err:
- SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return EXT_RETURN_FAIL;
- #else
- return EXT_RETURN_NOT_SENT;
- #endif
- }
- #ifndef OPENSSL_NO_COMP_ALG
- static int tls_comp_in_pref(SSL_CONNECTION *sc, int alg)
- {
- int i;
- /* ossl_comp_has_alg() considers 0 as "any" */
- if (alg == 0)
- return 0;
- /* Make sure algorithm is enabled */
- if (!ossl_comp_has_alg(alg))
- return 0;
- /* If no preferences are set, it's ok */
- if (sc->cert_comp_prefs[0] == TLSEXT_comp_cert_none)
- return 1;
- /* Find the algorithm */
- for (i = 0; i < TLSEXT_comp_cert_limit; i++)
- if (sc->cert_comp_prefs[i] == alg)
- return 1;
- return 0;
- }
- #endif
- int tls_parse_compress_certificate(SSL_CONNECTION *sc, PACKET *pkt, unsigned int context,
- X509 *x, size_t chainidx)
- {
- #ifndef OPENSSL_NO_COMP_ALG
- PACKET supported_comp_algs;
- unsigned int comp;
- int already_set[TLSEXT_comp_cert_limit];
- int j = 0;
- /* If no algorithms are available, ignore the extension */
- if (!ossl_comp_has_alg(0))
- return 1;
- /* Don't attempt to compress a non-X509 (i.e. an RPK) */
- if (sc->server && sc->ext.server_cert_type != TLSEXT_cert_type_x509)
- return 1;
- if (!sc->server && sc->ext.client_cert_type != TLSEXT_cert_type_x509)
- return 1;
- /* Ignore the extension and don't send compressed certificates */
- if ((sc->options & SSL_OP_NO_TX_CERTIFICATE_COMPRESSION) != 0)
- return 1;
- if (!PACKET_as_length_prefixed_1(pkt, &supported_comp_algs)
- || PACKET_remaining(&supported_comp_algs) == 0) {
- SSLfatal(sc, SSL_AD_DECODE_ERROR, SSL_R_BAD_EXTENSION);
- return 0;
- }
- memset(already_set, 0, sizeof(already_set));
- /*
- * The preference array has real values, so take a look at each
- * value coming in, and make sure it's in our preference list
- * The array is 0 (i.e. "none") terminated
- * The preference list only contains supported algorithms
- */
- while (PACKET_get_net_2(&supported_comp_algs, &comp)) {
- if (tls_comp_in_pref(sc, comp) && !already_set[comp]) {
- sc->ext.compress_certificate_from_peer[j++] = comp;
- already_set[comp] = 1;
- }
- }
- #endif
- return 1;
- }
- static int init_server_cert_type(SSL_CONNECTION *sc, unsigned int context)
- {
- /* Only reset when parsing client hello */
- if (sc->server) {
- sc->ext.server_cert_type_ctos = OSSL_CERT_TYPE_CTOS_NONE;
- sc->ext.server_cert_type = TLSEXT_cert_type_x509;
- }
- return 1;
- }
- static int init_client_cert_type(SSL_CONNECTION *sc, unsigned int context)
- {
- /* Only reset when parsing client hello */
- if (sc->server) {
- sc->ext.client_cert_type_ctos = OSSL_CERT_TYPE_CTOS_NONE;
- sc->ext.client_cert_type = TLSEXT_cert_type_x509;
- }
- return 1;
- }
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